EP0102323B1 - Klemmvorrichtung für Lichtbogenofenelektroden - Google Patents

Klemmvorrichtung für Lichtbogenofenelektroden Download PDF

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Publication number
EP0102323B1
EP0102323B1 EP83810334A EP83810334A EP0102323B1 EP 0102323 B1 EP0102323 B1 EP 0102323B1 EP 83810334 A EP83810334 A EP 83810334A EP 83810334 A EP83810334 A EP 83810334A EP 0102323 B1 EP0102323 B1 EP 0102323B1
Authority
EP
European Patent Office
Prior art keywords
electrode
spacers
contact elements
clamping
clamping assembly
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP83810334A
Other languages
English (en)
French (fr)
Other versions
EP0102323A2 (de
EP0102323A3 (en
Inventor
Inge Dr. Lauterbach
Dieter Dr. Zöllner
Thomas Dr. Taube
Hanns-Georg Dr. Bauer
Hans Lades
Siegfried Liebel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Arc Technologies Systems Ltd
Original Assignee
Arc Technologies Systems Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Arc Technologies Systems Ltd filed Critical Arc Technologies Systems Ltd
Priority to AT83810334T priority Critical patent/ATE30826T1/de
Publication of EP0102323A2 publication Critical patent/EP0102323A2/de
Publication of EP0102323A3 publication Critical patent/EP0102323A3/en
Application granted granted Critical
Publication of EP0102323B1 publication Critical patent/EP0102323B1/de
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B7/00—Heating by electric discharge
    • H05B7/02—Details
    • H05B7/10—Mountings, supports, terminals or arrangements for feeding or guiding electrodes
    • H05B7/103—Mountings, supports or terminals with jaws
    • H05B7/105—Mountings, supports or terminals with jaws comprising more than two jaws equally spaced along circumference, e.g. ring holders

Definitions

  • the invention relates to a clamping assembly for an arc furnace electrode comprising a support arm having a receiving ring with at least one clamping jaw arranged within the receiving ring, an upper shaft of the electrode being clamped within the opening of the receiving ring by means of the clamping jaws.
  • British patent application 2082028 describes a clamping device for arc furnace electrodes which includes a clamping shoe (2) for contacting an electrode, this shoe having axial grooves (10) in which graphite bars (8) are arranged. By pressing the electrode by means of a band against this clamping shoe (2) the graphite bars (8), received within said grooves (10) are pressed against the body of the electrode (6), establishing mechanical and electrical contact therebetween.
  • the graphite bars (8) have a length which is many times their diameter. Often under usual contact pressures, the risk of breakage for these long, thin graphite bars is relatively high.
  • European patent application 75534 describes an electrode having graphite segments along its periphery attwo axially moved clamping positions which are firmly connected to the metal shaft of the electrode.
  • graphite segments are to prevent direct contact between the metallic clamping jaws and the upper shaft of the electrode, as far as such jaws and shaft consist of metal, since such contact would lead to weld connections during operation and, consequently, to a rigid connection between the electrode and the support arm.
  • GB-A-122,034 discloses a clamping assembly for an arcfurnace electrode comprising a receiving ring on a support arm, the receiving ring comprising several clamping jaws for pressurized engagement with an electrode.
  • the clamping jaws described in this patent directly contact the outer surface of the electrode.
  • Clamping assemblies of that type may be used for conventional electrodes comprised of full graphite cylinders.
  • the object of the present invention is to provide an electrode assembly for electric arc furnaces capable of being clamped for support within the furnace at variable position along the axis of the electrode, without significant risk of breakage to the graphite segments or lengthy interruptions of furnace operations, while only a relatively small number of graphite segments are required at the same time.
  • the present invention provides a clamping assembly for an arc furnace electrode as set out in the preamble characterized in that a spacing means is arranged between the upper shaft of the electrode and the clamping jaws; that said spacing means comprises an upper and a lower ring flange spaced apart by spacers and extending parallel to the axis of the electrode, whereby the ring flanges and the spacers are arranged around the upper shaft of the electrode such as to define lateral openings between adjacent spacers, and that electrically conductive contact elements are radially movable arranged within the lateral openings such as to register with the clamping jaws configured to apply pressure onto the contact elements thereby pressing them against the upper shaft of the electrode.
  • the lateral openings or apertures are slots which are parallel to the axis of the supporting structure constituted by the upper and lowerflange andthe spacers.
  • the electrode assembly will include at least three such slots that may include a plurality of cross pieces subdividing the said slots into individual orifices with each orifice being configured to receive a contact element.
  • the supporting structure comprises a fixation means to engage the spacing means with the receiving ring, as to secure the spacing means to the clamping means in a manner independently from the electrode and allow relative movement between the electrode and the spacing means.
  • the contact elements are comprised of graphite; while the supporting structure consists of a metal.
  • the electrode assembly includes a top flange and a bottom flange interconnected by spacers which are parallel to the axis of the electrode and which are separated from each other so as to define said slots.
  • a radial dimension of the spacers in such embodiments is generally smaller than a radial dimension of corresponding contact pieces received within the slots to properly abut on the upper shaft of the electrode.
  • the contact elements on the spacers in such embodiments may be positively interlocked one to the next.
  • a plurality of contact element components may be inserted into each slot, which results in improved durability and better security against breakage.
  • Figure 1 is a side elevation view of an electrode assembly in accordance with the invention partially in cross section.
  • Figure 2 is a transverse horizontal section of the assembly shown in Figure 1.
  • Figure 3 is a side elevation view in partial cross section including an alternate embodiment of the contact elements and the supporting structure.
  • Figure 4 is a sectional view of the electrode of Figure 3 analogous to Figure 2.
  • Figure 1 depicts an upper shaft (11) of an electrode for arc furnaces held by a clamping means with an electrode support arm (50).
  • the clamping means defines a cylindrical bore (13) of the arms (50), in which the spacing means (14) is located.
  • a ring flange (15) is screwed on top of the top of the spacing means.
  • This flange has two or more peripheral projections (16) the outside diameter of which is greater than the diameter of the bore (13). In this way it is possible to hang the spacing means (14) within the bore (13).
  • the spacing means has a cone-shaped chamfer on its bottom edge, which is to facilitate insertion into the bore (13).
  • the spacing means basically comprises a supporting structure consisting of a top flange (15) and a bottom flange (33) which are connected by spacers (17) which define slots between each other. These slots contain contact elements (18) of graphite. Clamping jaws (19) press these contact elements against the electrode.
  • a fastening drive or lever (20) is connected to the clamping jaw (19) in a movable manner by means of a ball-and-socket joint (21, 22).
  • the clamping force pressing the lever (20) towards the electrode is produced e.g. by a hydraulic cylinder or by spiral springs (not shown), in a suitable or conventional manner.
  • the lever (20) and the ball-and-socket joint (21, 22) are arranged within the support arm (50) which includes top and bottom members (12 and 12') and a receiving ring (51). In this manner the joint (21, 22) will be protected from pollution.
  • the electrode At its upper end, the electrode has a slide- through preventer in the form of a crossbar (23) to which a holding bow (24) is affixed.
  • This holding bow permits the axial movement of the electrode, i.e. it may be raised or lowered.
  • One advantage offered by the capability for clamping the electrode at various positions along the length of the electrode is the extension of the operable range of'the electrode support arm.
  • Figure 2 shows a transverse horizontal section of the electrode assembly illustrated in Figure 1 taken on line II-II of Figure 1.
  • the spacing means comprises three spacers (17, 17', 17"), which are evenly distributed on the periphery and which define lateral openings which are parallel to the axis. Within these lateral openings are placed three contact elements (18, 18', 18"). The lateral contours of the contact elements (18 to 18") have a smaller diameter than the internal contours of the spacers (17 to 17"). In clamped position, they are in direct contact with the cylindrical surface of the upper shaft (11) of the electrode.
  • the electrode may be of the conventional type, i.e.
  • a metallic type of electrode is schematically illustrated in Figure 2 by two concentric metal pipes (11' and 11"), cooling water passing down the inner pipe and up again through a ring or annular space produced by the two pipes.
  • the clamping jaw (19) is radially aligned with the contact element (18) and it is pressed against the electrode in the manner illustrated in Figure 1.
  • contact elements which generally consists of graphite
  • contact elements which generally consists of graphite
  • Figure 3 illustrates an electrode clamping assembly analogous to that of Figure 1 with the exception of the spacing means (14), with the contact elements consisting of axially separated components (18a, 18b, 18c), which are separated by spacer rings (30, 30') intersecting the spacers so as to form spacer sections (17a to 17c).
  • the contact element (18) of Figure 1 is subdivided into three segments (18a to 18c) which are separated by the spacer rings (30 and 30').
  • the spacer sections (17a to 17c) are connected by bolts (32) leading from the top flange to the bottom flange (33).
  • the spacers (17) may consist of one piece and the spacer rings (30 and 30') may be intersected from segments.
  • the spacing means (14) To complete the spacing means (14), three spacers (17) are mounted on the bottom flange (33), with the contact elements (18, 18' and 18") being arranged in between them.
  • the spacer rings (30 and 30') between the spacers are optional.
  • the top flange (15) is put on the spacers and fastened thereon so that at least the contact elements remain movable to a certain extent.
  • the contact elements are self supporting during the assembly of the spacing means.
  • a design configuration according to Figure 3 prevents the elements (17) from falling out of the supporting structure, while an additional configuration according to Figure 2 prevents the elements from falling into the supporting structure.
  • the contact elements may be laterally profiled to facilitate engagement of the spacers.
  • spacer rings (30, 30') as well as the spacer segments (17a to 17c) incorporate bores which receive the bolts (32).
  • the spacers (17a to 17c) may be simply bent at the top and at the bottom and then directly fastened to the flanges by bolts or other connecting means.
  • Figure 4 shows a section view of an assembly in which the contact elements (18a to 18c) and the spacers (17, 17', 17") are analogous to Figure 2.
  • the spacers (17, 17' and 17") typically can be made from sheet metal bent on the top and at the bottom and mounted to the flanges by means of screws or the like.
  • the sides of the contact elements have axial grooves for the engagement of the spacers.
  • a plurality of contact elements without spacing means are arranged one above the other to fill the space between the two flanges.
  • spacers (17) made from sheet metal bars may be employed in pairs positioned in the grooves of the contact elements.
  • the electrode support arm (50) On the side of the electrode, the electrode support arm (50) has a ring (51) on whose internal contour the contact elements rest snugly.
  • a known device for the transmission of force presses a clamping jaw (53) against the electrode (11) to provide clamping.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Furnace Details (AREA)
  • Discharge Heating (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Electric Stoves And Ranges (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Claims (8)

1. Klemmvorrichtung für eine Lichtbogenofenelektrode mit einem, einen Aufnahmering (51) sowie mindestens eine, innerhalb des Aufnahmerings (51) angeordnete Klemmbacke (19; 53) aufweisenden Tragarm (50), wobei ein oberer Schaft (11) der Elektrode innerhalb der Oeffnung (13) des Aufnahmerings (51) mittels der Klemmbacken (19) eingeklemmt ist, dadurch gekennzeichnet, dass eine Abstandshalteeinrichtung (14) zwischen dem oberen Schaft (11) der Elektrode und den Klemmbacken (19) angeordnet ist, dass diese Abstandshalteeinrichtung (1) einen oberen (15) und einen unteren Ringflansch (33) aufweist, welche durch parallel zur Elektrodenachse angeordnete Abstandshalter (17, 17', 17") voneinander getrennt gehalten sind, wobei die Ringflansche (15, 33) und die Abstandshalter (17, 17', 17") derart um den oberen Schaft (11) der Elektrode herum angeordnet sind, dass hierdurch zwischen benachbarten Abstandshaltern seitliche Oeffnungen gebildet werden, und dass elektrisch leitende Kontaktelemente (18, 18', 18") radial verschiebbar innerhalb dieser seitlichen Oeffnungen derart angeordnet sind, dass sie mit den Kontaktbacken (19; 53) fluchten, welche so ausgelegt sind dass sie Druck auf die Kontaktelemente (18, 18', 18") ausüben und hierdurch diese gegen den oberen Schaft (11) pressen können.
2. Klemmvorrichtung nach Anspruch 1, worin die Abstandshalteeinrichtung (14) eine, mit dem Aufnahmering (51) zusammenarbeitende Halteeinrichtung aufweist.
3. Klemmeinrichtung nach Anspruch 1 oder 2, worin die seitlichen Oeffnungen durch Querteile (30, 30') in mehrere Löcher unterteilt sind, wobei jedes Loch ein eigenes Kontaktelement (18a, 18b, 18c) enthält.
4. Klemmvorrichtung nach Anspruch 1, worin jede seitliche Oeffnung eine Mehrzahl von Kontaktelementen (18a, 18b, 18c) enthält.
5. Klemmvorrichtung nach irgend einem der vorhergehenden Ansprüche, worin die Kontaktelemente (18, 18', 18") aus Graphit bestehen.
6. Klemmvorrichtung nach irgend einem der vorhergehenden Ansprüche, worin die Ringflansche (15, 33) und die Abstandshalter (17, 17', 17") aus Metall bestehen.
7. Klemmvorrichtung nach irgend einem der vorhergehenden Ansprüche, worin die radialen Dimensionen der Abstandshalter (17, 17', 17") kleiner sind als die der Kontaktelemente (18a, 18b, 18c).
8. Klemmvorrichtung nach irgend einem der vorhergehenden Ansprüche, worin die Kontaktelemente (18a, 18b, 18c) und die Abstandshalter (17, 17', 17") formschlüssig miteinander verbunden sind.
EP83810334A 1982-08-26 1983-07-22 Klemmvorrichtung für Lichtbogenofenelektroden Expired EP0102323B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83810334T ATE30826T1 (de) 1982-08-26 1983-07-22 Klemmvorrichtung fuer lichtbogenofenelektroden.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH5069/82 1982-08-26
CH506982 1982-08-26

Publications (3)

Publication Number Publication Date
EP0102323A2 EP0102323A2 (de) 1984-03-07
EP0102323A3 EP0102323A3 (en) 1984-09-26
EP0102323B1 true EP0102323B1 (de) 1987-11-11

Family

ID=4287418

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83810334A Expired EP0102323B1 (de) 1982-08-26 1983-07-22 Klemmvorrichtung für Lichtbogenofenelektroden

Country Status (18)

Country Link
US (1) US4531219A (de)
EP (1) EP0102323B1 (de)
JP (1) JPS5990388A (de)
KR (1) KR840006063A (de)
AT (1) ATE30826T1 (de)
AU (1) AU1722483A (de)
BR (1) BR8304199A (de)
CA (1) CA1212978A (de)
DD (1) DD217392A5 (de)
DE (1) DE3374516D1 (de)
ES (1) ES524130A0 (de)
HU (1) HU185838B (de)
IN (1) IN158701B (de)
NO (1) NO832802L (de)
PL (1) PL243463A1 (de)
SU (1) SU1284467A3 (de)
YU (1) YU162983A (de)
ZA (1) ZA835228B (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4907001B2 (ja) * 2000-10-05 2012-03-28 ジャパンスーパークォーツ株式会社 アーク溶融用カーボン電極の保持装置
DE102004005051A1 (de) * 2004-01-30 2005-08-18 Arndt Dung Am freien Ende eines Bestandteil eines Elektroofens bildenden Elektrodentragarms auswechselbar angeordnete Kontaktbacke

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2082028A (en) * 1980-08-05 1982-02-24 British Steel Corp Improvements in furnace electrode clamps

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2700692A (en) * 1955-01-25 carleton
US871338A (en) * 1906-04-21 1907-11-19 Electro Metallurg Francaise Soc Electric furnace.
GB122034A (en) * 1918-01-12 1919-01-13 Charles William Kayser Improvements in Electrode-holders for Electric Furnaces.
CH254393A (de) * 1944-06-16 1948-04-30 Norske Elektrokemisk Ind As Geschlossener elektrischer Schmelzofen.
FR1255504A (fr) * 1960-01-28 1961-03-10 Pechiney Prod Chimiques Sa Pince à électrode pour fours électriques
US3457355A (en) * 1967-09-19 1969-07-22 Vitro Corp Of America Brush electrode assembly for consumable electrodes
US3717445A (en) * 1969-11-12 1973-02-20 Mitsubishi Steel Mfg Electrode holder for electric arc furnace and make the same
JPS5019239Y1 (de) * 1970-09-07 1975-06-11
GB1404661A (en) * 1972-07-07 1975-09-03 British Steel Corp Furnace electrode clamp
FR2363958A1 (fr) * 1976-09-07 1978-03-31 Bozel Electrometallurgie Perfectionnements apportes au dispositif de montage d'une plaque de contact pour une electrode de four electrique
US4182927A (en) * 1978-08-04 1980-01-08 Dixie Bronze Company Electrode holders having differential clamping devices
US4323717A (en) * 1979-02-07 1982-04-06 British Steel Corporation Furnace electrode clamps
JPS6042478U (ja) * 1983-08-26 1985-03-26 トヨタ自動車株式会社 多点抵抗溶接装置

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2082028A (en) * 1980-08-05 1982-02-24 British Steel Corp Improvements in furnace electrode clamps

Also Published As

Publication number Publication date
HU185838B (en) 1985-04-28
EP0102323A2 (de) 1984-03-07
DD217392A5 (de) 1985-01-09
CA1212978A (en) 1986-10-21
BR8304199A (pt) 1984-06-12
IN158701B (de) 1987-01-10
YU162983A (en) 1985-12-31
AU1722483A (en) 1984-03-01
DE3374516D1 (en) 1987-12-17
SU1284467A3 (ru) 1987-01-15
US4531219A (en) 1985-07-23
JPS5990388A (ja) 1984-05-24
PL243463A1 (en) 1984-07-16
ZA835228B (en) 1984-04-25
NO832802L (no) 1984-02-27
ES8501874A1 (es) 1984-12-16
KR840006063A (ko) 1984-11-21
ES524130A0 (es) 1984-12-16
ATE30826T1 (de) 1987-11-15
EP0102323A3 (en) 1984-09-26

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